6p14p-er tubes matched quad. 

Gold grid. 

Tested strong. 

Matched current and Gm.

Long life tubes. 

-er - indicate an increased level of reliability and durability.  

The letter "r" in this case means that the reliability factor = 0.999

If you need matched octet please ask. 

International shipping. 

Shipping time 2-8 weeks. 

I have more 10 000 tubes,  please ask you interested tubes.